TODAY JAN26
TEMPERATURE49
HUMIDITY59
PRESSURE29.93
WIND COND.290 9.4
  • 5741Tue30%
  • 6143Wed
  • 6348Thu70%
  • 5645Fri
  • 6044Sat
daynightWeather update from San Diego, Brown Field Municipal Airport at

Key findings

  • The highest monthly average temperature in San Ysidro for August is 71 degrees
  • The lowest monthly average temperature in San Ysidro for December is 58 degrees
  • The most monthly precipitation in San Ysidro occurs in December with 2.2 inches
  • The air quality index in San Ysidro is 29% worse than the national average
  • The pollution index in San Ysidro is 804% worse than the national average

Compare San Diego, CA Weather

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      San Ysidro Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January49°F68°F58°F1.7"
      February51°F68°F59°F1.8"
      March54°F69°F60°F1.0"
      April56°F70°F62°F0.6"
      May60°F70°F64°F0.4"
      June62°F72°F66°F0.0"
      July66°F76°F70°F0.2"
      August67°F78°F71°F0.0"
      September66°F78°F71°F0.2"
      October61°F77°F68°F0.5"
      November55°F73°F63°F0.9"
      December49°F67°F58°F2.2"

      San Ysidro air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexSan YsidroSan DiegoCalifornia
      Air quality index646455
      Pollution index45,820,50045,820,50018,106,726

      San Ysidro air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality87
      Days with moderate air quality253
      Days w/ poor A.Q. for sensitive groups23
      Days with unhealthy air quality2

      San Ysidro air quality information

      PollutantTotal
      Arsenic1.130%
      Benzene0.410%
      Carbon Tetrachloride0.030%
      Lead0.600%
      Mercury0.080%

      Average monthly San Ysidro temperature with heat index

      San Ysidro monthly precipitation with daily maximum

      San Ysidro monthly snow depth with daily maximum

      San Ysidro monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Bonita, CA12,8856428%
      Jamul, CA5,6406428%
      Spring Valley CDP (Lake County), CA1,1546428%
      Rancho San Diego, CA22,0186428%
      Chula Vista, CA260,5986428%
      San Diego, CA1,374,8126428%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      San Antonio, TX1,439,358492%
      Dallas, TX1,278,433512%
      Phoenix, AZ1,555,3247448%
      Philadelphia, PA1,559,938512%
      San Jose, CA1,009,3634314%
      San Diego, CA1,374,8126428%
      Source: The San Ysidro, San Diego, CA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.